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Writing this before I read all the other theories here:
- The Ricin is for Lydia to sneak in her Tea. Walt originally wanted to turn himself in after calling the Feds from the Tavern's booth. Watching the Report where he sees Elliot and Gretchen discredit him after it's mentioned the Blue Meth is still in Circulation in both the South West and Europe is what triggers him to return home instead. Killing Lydia makes sure the distribution of the Blue Meth dies.
- The Machine Gun is obviously for Jack and his Nazi Crew, maybe even for Jesse so that the Blue Meth dies once and for all production wise
- As for conflicts between Skylar, Marie and Flynn...... I got nothing. I wouldn't be surprised if one of them, if not all of them end up dead.
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